# 时间戳转时间字符
res = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))

# 获取当前时间
now_time = datetime.datetime.now()

# 时间字符转时间格式
start_date = datetime.datetime.strptime('2021-05-23',"%Y-%m-%d")

# 天数相加见
end_date = datetime.datetime.strptime('2021-05-22',"%Y-%m-%d") + datetime.timedelta(days=3)